(1) heptane

(2) 2-methylhexane

(3) 3-methylhexane

(4) 2,2-dimethylpentane

(5) 2,3-dimethylpentane

(6) 2,4-dimethylpentane

(7) 3,3-dimethylpentane

(8) 3-ethylpentane

(9) 2,2,3-trimethylbutane